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Full text of "Geology and ground-water resources of Rockland County, New York"

UNITED STATES GEOLOGICAL SURVEY 


COOPERATIVE GROUND- WATER REPORT 


.18 
Well or test boring completed in unconsolidated deposits 


10' 


05' 


BULLETIN GW 42 
NEW YORK WATER POWER AND CONTROL COMMISSION PLATE I 
5 . _------ 
co UtitY -- ---- 
-----.!:u.!
 E 
tiRCOU;ty 
_ __ VI Est C,", 
eor Mtn. 
Bridoe 


MAP OF 


ROCKLAND 


COUNTY, 


NEW YORK 


SHOWING 


LOCATION 


OF WELLS 


AND SPRINGS 
l¥ 
c..0

 I 
+
 
 

 9'. ,,'t' 
()
+ 
/
o 
/ 
/ 
/ 
/ 


41° 16 
15'- 


16 


1° 
15' 


/ 


10' 


10' 


/ 
/ 
"''''''',,--,/'' 
 . 


''')4
".,. () 
 
+
 
, .............. 
I "'" 0197 
...... 
....... HJllb
rn 

95 
...... 
........ 


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, 
I 
, 
I 
, 
I 
, 
I 
, 


E X PLANATION 



 

 
<t) 

 
::;) 

 
1 
I 
I 
I 


" 


6' 


# 
Tarrytown 



20 
Spri n g issuing from bedrock 


\ h 
\ I 
, 
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J
 

18 

Ia: 
'->w 
't- 
°lU) 
z'" 
ex 

IU 

r 
'->CI) 
0", 
a:,=- 
I 
, 
I 
I 
I 4,° 
I 
---I 00 
J 
, 
, 
55' I 


0 2 ' 
Well or test boring completed in bedrock 


;3 
Spring issuing from unconsolidated deposits 


Figures ore well and spring numbers; prefix "Ro" is omitted on mop. 
For additional data, see tables IO,16,and 17. 


41° 
00 SCALE 
'/2 0 2 3 4 Mlles X 
I 
la' 05' 74°00' 



UNITED STATES GEOLOGICAL SURVEY 


10 


COOPERATIVE GROUND -WATER REPORT 


NEW YORK WATER POWER AND CONTROL 


0'" 


MAP 


ROCKLAND 


OF 


COUNTY, 


YORK 


NEW 


SHOWING BEDROCK GEOLOGY 


AN D GENERALIZED SECTION A-AI 


41° 
I" 


10' 


'- 


EXPLANATION 


" 


tr+ R I +J 
Ladentown diabase (of Hartnagel) 
Dark gray,fine grained, vesicular 

 
R i)
I
 
Pa II s a des diabase and minor int rusives 
Dark gray. hard, fine-to coarse-grained 

R n "'-, 
Newark group 
Sandstone, shale, and conglomerate. Red, brown, 
and gray. Principal oqulfer 

 Oh r:
 
Hudson River formation 
Shale. sandstone, and phyllite, dark gray 



 -o£ .::t 
Ordovician and Cambrian rocks 
UndIfferentIated quartzite (qtz), limestone Us), and shale (sh) 
r O€ sJ 
Stockbridge limestone 
Limestone and dolomite. Blue and gray 


41- 
00' 


1 .....1:'.. . ' 1 
::.-vc':=.:; 
Cheshire quartzite 
Light gray and tan, ha rd, gla ssy 

 p £ 2.1 
precambrian rocks 
(Undifferentiated gneiss, 
ronlte. schist, 
ond minor basic Intrusive rocks of doubtful oge) 
U___ 
.....-" 
Normal fault 
U, upthrown side: 0, downthrown,slde 
-r-r 
Thrust fault 
T, overthrust side 
15fY 
Strike and dip 
(Figure is angle of dip in degrees) 


>f 
J-z 
z::> 
::>0 
0 0 
01 0 

IZ 
 
<!)ct QI 

i
 > 
0: 0 a: 
00: 
 
I c 
A 
 
.J:: 
I Ramapo Mountains 0 
I :!!: 
1000 J 
0' > 
-1 ,,-1 
L ....a 7 


(Chiefly Precambrian and Lower Palezolc (?) 
igneous and metamorphic rocks.) 


41° 
I" 


o 
(f) 
(f) 
ct 
0: 
I- 


- 
CI) 
.x 
a:. u 
0 
\ .. 
\ u 
.c:. 
\ a. 
\ .. 
0 
E 
c 
\ - 
" 
E 
\ - 10 
'" (\-. 
0 
" .0 
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, 0 
(1) 
\ 0 
a.. 
\ 
\ 
 
(1) 
3 
\ 0 
..J 
\ "0 
c: 
, 0 
, II: 
C 
, .;: 
I .0 
E 
0 
I 0 
I (1) 

 
I a.. 
I 
 
"- 
(1) 
, L; 

 0 
t) 
CI) 
<::) 

 

 os' 


Z 
}I 


't°Ck 
(1 
'i:...4 'v 

G 
() 

",..... Co 
C
v 't 
Ouit
r 
1'r"- 


'0 
cZ 
O
 
ZU 
<[- 
-> 
0:0 
mo 

o: 

o 
o 


Note: Strike and dip measurements of Newark group largely 
after Kiimmel (1899). Geology of Precombrian rocks in 
northern Rocklond County o"d of Paleozoic rocks in 
Westchester County after Berkey and Rice (1921). 


}! 
II 
Q. 


SCALE 


...."'
 
4'
 ro 
v
....IYk' 
...

 
s

 


1/2 


3 


4 Miles 


o 


2 


----- 
----- 


41° 
00' 


05' 


74°00' 


55' 


Sardonia 
I 



 
o 
0... 

(1) 
(1» 

.- 
on:: 
o 
::x: 
I 



 
C:lo 
g l o 
u... 
cu 
"O I 
 
c: cu 
o.s= 

 I I
 
°cu 
o:
 
I 
I 


1000' 
o' 


AI 


Generalized section along line A-A' 



UNITE D STATES GEOLOGICAL SURVEY 


COOPERATIVE GROUND-WATER REPORT 


10 


05' 


74"00' 


NEW YORK WATER POWER AND CONTROL 



 
\ 
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\ 
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\ 
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, 
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, 
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I 
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COUNT"t 
'O
A"ft
OUMT 
- -"il6TC"£"'\ 


MAP 


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t'c,O 



o 
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o
c,'" 
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, 
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/ /.::/ 
f!./ 
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).!! 

 ["I y - 
, 
/ 
, 
/ 
, 
/ 
, 
/ 


OF 


ROCKLAND 


COUNTY, 


NEW YORK 


SHOW IN G DISTRI B UTION AND THI CKNESS 
Till, STRATIFIED DRIFT, AND AllUVIUM 


OF 


41. 
15' 


, 
/ A 
, /,
-;::!!.;') 
'/ 
 
=' .(.::\ 
, l:j /.
=J'''' 
c;;J' /':.9- 
1.;........ 


/ x 

 .9 
X 
10' 
.'8 


" 


EXPLANATION 


05' 


1": ' =: 
. 
'::.:. 

 
Stratified drift and alluvium 
Beds and lenses of orovel, sand, slit, and clay; In so",e places predominantly 
varved cloy and sflt. Permeable bed$ of sand and oravel yield as much as 
1700 opm of water. 


Till 


Unstrattfied and unsorted compact clay, silt, sand, gravel, and boulders; 
relatively low permeability; yields small quantities af wate r to large 
diameter wells. 


x 


. 20 
Thickness of unconsolidated deposits penetrated 
by a well or test boring that reached bedrock 


)C 


..!} 
Thickness of unconsolidated deposits penetrated 
by a well or test boring that did not reach bedrock. 


x 
Outcrop of Newark group 
(Outcrap of other bedrock units too numerous to show on mop) 
B B I 
f I 
Location of geologic section 


Unconsolidated deposits In part after soils map 
(U. $. Department of Agriculture, 1919) Outcrops 
of Newark group in part after Kummel (1899) 


SCALE 


41. 
00' 


o 


4 Mil" 
I 


2 
I 


3 
I 


.... ...... ..... ...... .... . 


10' 


74"0' 


05 


41 0 
'.5' 


10 


41 0 
00' 



COOPERATIVE GROUND-WATER REPORT 


UNITE 


SECTION B-B' ACROSS HUDSON RIVER AT TAPPAN ZEE BRIDGE 


South 
Nyack 
B 


,::
 


i -300 
.! 
., 
.. 
.. 
. 

 -400 
.a 


.. 
.. 
... 


-100 


-100 


d 
Sli5 
01... 

Ii 
River bottom I 
12 " 13 7 14 15. 17 18 I 20 21 4 S 7 28 29 0 31 34 

:
:
----- I 
"
" 

-
:
 : :::'i

 - 

- 
'71
'
i
;
f
I;-
;!:

!
-!
i

I
i:P 
\ = C
1':" 
 - 
 
\ ...- 


- ;g- =-
- - 
 - Iif'
 
\ Plelltocene deposltl 
 -
;:
 
\ =/ / I', 
_- -'" / :b.. 
\ ,- /-- 
? 1- Y 
N..ark group / . 
\ 
 7 
\ // /.
 
\ / /- /.<::-"
 
\ / N..ark group /'..,ti 
\ ? /. /.o 
... 
\ / 
 
\ " /..l 
/. /
 
? // " 
\ / /. 
/ 7 
\. / / 
\ 
 /. 
\ / / 
, / 
 
'--?

 / 
/. 


Tarrytown 
st 
S.o 
I'v.' 


-200 


Precambrian 
rockl 


EXPLANATION 


-500 


£mID 
Sand 
1521 
Gravel 

 
Slit 

 
Clay 

 
Peat 


FllJlla 
Red and gray londstone and shole 
Illi1.j 
Gnelll 
E@] 
Boulderl 
. 
Shelll 
12 
Number olligned to 
t.lt hole by contractor 


Note:Lln. of ltetlon Ihown on Plate 3. 


Precambrian rock I 


LOOI of telf boring I supplied by N.w York Stott Thruway Authority 
Burl.d chonn.'ln N.wark group b.t...n borings 12 and 17 
adopt.d from sellmlc prafll. by worzel and Drake U9591. 
HORIZONTAL ICALE 
4 
q I I I Ii 4<1 0 I 
 O'[[T 


-1'00 


Vertical Icol. exaggerat.d about 8 tlmea